{
  "family": "winexe",
  "sample_count": 2,
  "category": "advanced_threat",
  "description": "HackTool:Win32/Winexe (or simply `winexe`) is a legitimate, open-source GNU/Linux utility that allows users to execute commands remotely on Windows operating systems from a GNU/Linux host. It functions similarly to Microsoft's Sysinternals PsExec. However, because it facilitates remote execution, it is heavily weaponized by threat actors (particularly those operating from Linux-based C2 infrastructure or Kali Linux pivot machines) to achieve lateral movement and Remote Code Execution (RCE) on Windows targets (`T1569.002`).<br><br><b>Understanding Winexe (Living off the Land)</b><br>To an end-user, `winexe` execution is invisible. For a security operations center, the detection of `winexe` activity is a critical incident indicating that an attacker has compromised credentials and is actively moving laterally across the network from a Linux-based platform. Because the underlying protocols (SMB/RPC) are legitimate, distinguishing malicious `winexe` use from legitimate administration (if Linux admins manage Windows boxes) requires deep behavioral analysis.<br><br><b>Execution and Lateral Movement Mechanics</b><br>An attacker requires valid Windows credentials (or a password hash for Pass-the-Hash attacks) and network access to the target's SMB ports (TCP 139/445). From their Linux machine, they run a command like `winexe -U DOMAIN/Admin%Password //192.168.1.10 'cmd.exe'`. Winexe connects to the Windows target via SMB (`T1021.002`), authenticates, accesses the hidden `ADMIN$` share, and drops a small service executable (typically named `winexesvc.exe`). It creates and starts a Windows Service to run this executable (`T1543.003`), which then executes the requested command (e.g., `cmd.exe`) and pipes the output back to the Linux attacker over a named pipe.<br><br><b>Indicators of Compromise & Impact</b><br>The impact is total control over the targeted Windows host. Host-based IoCs are highly specific: EDR alerts for the creation and execution of the `winexesvc.exe` service (often running from `%SystemRoot%`), and Windows Event Log 7045 (A service was installed in the system) detailing the `winexesvc` installation. Network IoCs include inbound SMB traffic (TCP 445) originating from unusual Linux hosts (or VPN endpoints) followed immediately by RPC traffic and named pipe communication.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Winexe and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Winexe is classified as a Advanced Threat. Documented across security telemetry, it is engineered to execute unauthorized operations, establish persistent footholds on target endpoints, and facilitate malicious campaigns targeting enterprise and individual environments."
      }
    },
    {
      "@type": "Question",
      "name": "How does Winexe establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Winexe typically establishes persistence through registry run keys, scheduled tasks, or service installations, while evading signature-based antivirus solutions through code obfuscation, memory injection, or anti-analysis sandbox checks."
      }
    },
    {
      "@type": "Question",
      "name": "What are the essential incident response steps for mitigating a Winexe compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Winexe should immediately isolate affected endpoints from the network, perform memory triage to capture volatile forensic artifacts, audit registry and startup persistence mechanisms, revoke exposed user credentials, and restore systems from verified, clean backups."
      }
    },
    {
      "@type": "Question",
      "name": "What lateral movement and credential access tactics does Winexe leverage in enterprise intrusions?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Winexe frequently utilizes privileged account harvesting techniques such as LSASS memory dumping, Kerberoasting, and token impersonation to escalate privileges. Once administrative credentials are acquired, it pivots across the victim network utilizing living-off-the-land binaries (LOLBins) such as WMI, PowerShell remoting, and PsExec, or abuses remote desktop protocols (RDP) to reach critical internal repositories and domain controllers."
      }
    },
    {
      "@type": "Question",
      "name": "How does Winexe maintain covert communications and evade perimeter network monitoring?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Winexe often relies on multi-stage command and control (C2) architectures utilizing encrypted protocols over standard web ports (HTTPS/443 or DNS tunneling) to blend in with legitimate enterprise network traffic. Many variants incorporate proxy networks, domain fronting, or cloud services (such as Microsoft Graph API, Google Drive, or Telegram) to masquerade C2 channels, bypassing traditional signature-based egress filtering."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1543.003",
    "T1021.002",
    "T1569.002"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1569.002",
      "name": "System Services: Service Execution (Abusing Windows Services to execute commands remotely)",
      "tactic": "Execution"
    },
    {
      "id": "T1021.002",
      "name": "Remote Services: SMB/Windows Admin Shares (Using SMB and ADMIN$ for lateral movement)",
      "tactic": "Lateral Movement"
    },
    {
      "id": "T1543.003",
      "name": "Create or Modify System Process: Windows Service (Creating the winexesvc service)",
      "tactic": "Persistence"
    }
  ],
  "containment_steps": [
    "Isolate the targeted Windows machine and, crucially, identify and isolate the Linux host from which the `winexe` command originated.",
    "Assume the credentials used by `winexe` are fully compromised and initiate an immediate, enterprise-wide password reset for that account.",
    "Use EDR to hunt across the network for the presence of `winexesvc.exe` or Event ID 7045 related to `winexe` to map the extent of lateral movement.",
    "Restrict SMB (TCP 445) communication between workstations; SMB should generally only flow between workstations and designated file servers/domain controllers."
  ],
  "what_to_avoid": [
    "Do not ignore `winexesvc.exe` detections assuming they are benign administrative activity unless you explicitly use Linux to manage Windows hosts in your environment.",
    "Avoid leaving the `ADMIN$` share enabled if it is not strictly required for centralized management tools."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ],
  "attack_stage": [
    "execution",
    "persistence"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows Server 2022",
    "Windows Server 2019"
  ]
}